Delhi's air quality drops to 'emergency' category
The city remained shrouded in pungent haze for the fourth consecutive day
Delhi is hoping for favourable meteorological conditions to blow away the toxic air
The blanket of haze over Delhi thickened on Friday morning with the national capital's pollution levels increasing overnight by around 50 points, taking the overall air quality index to 459. A Central Pollution Control Board official said the AQI entered the "severe plus" or "emergency" category late Thursday night, the first time since January this year.